Willow Springs International Raceway

Willow Springs International Motorsports Park is located near Rosamond and Lancaster, California, and is about an hour north of Los Angeles. It is a historic track that has been in existence for over fifty years. The first race held there was in 1953. The main track is a challenging 2.5 mile long road course that is unchanged from its original 1953 configuration. The interesting elevation changes and high average speeds make it a favorite of many road racing drivers.

More info at  en.wikipedia.org